A surface has a hemispherical, spectral emissivity of 0.3 from 0 to 3 µm and 0.8 from 3 µm to infinity. If the surface is at 600 K, what is its total, hemispherical emissivity?

BONUS: A pipe with inner diameter of 1 cm has internal flow with Reynolds number of 1,000. The flow can be considered to be hydrodynamically developed after what distance from the entrance to the pipe?

Assuming that the lump capacitance assumption is valid for the thermocouple in Problem 1, what is the time constant for it? (“A spherical thermocouple (radius of 3 mm, thermal conductivity of 20 W/mK, specific heat of 400 J/KgK, density of 8500 kg/m3) with initial temperature 20°C is suddenly exposed to air at 90°C (h = 200 W/m²·K)”)

Calculate the total heat transfer through a composite wall consisting of two layers (k₁ = 20 W/m·K, thickness₁ = 0.02 m; k₂ = 40 W/m·K, thickness₂ = 0.04 m) with a temperature difference of 20°C across it per unit area.

BONUS 1: A finned surface consists of 10 plates, each having surface area of 10 cm2 and efficiency of 0.8. If the total surface area of the finned surface is 140 cm2, what is the overall efficiency of the finned surface .

Calculate the thermal resistance for heat conduction through a cylindrical wall (inner radius = 0.03 m, outer radius = 0.05 m, k = 30 W/m·K) per unit length (i.e., length of 1 m):

An effective Symposium has which of the following?

Participating authentically means to keeping quiet about concerns regarding the group to avoid conflict.

Information-Gatherer is a Maintenance-Oriented Role that gathers and delivers back the information to the group.

(3 points each) Simplifying the following expressions: a.